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jit_ast_visitor.py
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jit_ast_visitor.py
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from jit_code_generator import *
from collections import defaultdict
class AstVisitor:
def __init__(self):
#self.output = open(filename, 'w')
self.code_generator = CodeGenerator()
#list of dicts
self.env = [defaultdict(lambda:None)]
def enter_scope(self, env):
self.env.append(env)
def exit_scope(self):
self.env.pop()
def visit_fun(self, fun_node):
if fun_node.subtype == "say":
sentences = (param.accept(self) for param in fun_node.params)
lst = self.code_generator.generate_list(sentences)
prtstr = "'\\n'.join(%s)" % lst
code = self.code_generator.generate_print(prtstr)
#self.output.write(code + '\n')
elif fun_node.subtype == "createNode":
#self.output.write("Node()")
code = "Node()"
elif fun_node.subtype == "listen":
code = "raw_input()"
elif fun_node.subtype == "push":
visited_params = map(lambda node : node.accept(self), fun_node.params)
params_str = ', '.join(visited_params)
code = "push(%s)\n" % params_str
elif fun_node.subtype == "pull":
visited_params = map(lambda node : node.accept(self), fun_node.params)
params_str = ', '.join(visited_params)
code = "pull(%s)\n" % params_str
elif fun_node.subtype == "save":
visited_params = map(lambda node : node.accept(self), fun_node.params)
params_str = ', '.join(visited_params)
code = "save(%s)\n" % params_str
elif fun_node.subtype == "get":
visited_params = map(lambda node : node.accept(self), fun_node.params)
params_str = ', '.join(visited_params)
code = "get(%s)\n" % params_str
elif fun_node.subtype == "import":
visited_params = map(lambda node : node.accept(self), fun_node.params)
params_str = ', '.join(visited_params)
code = "import(%s)\n" % params_str
elif fun_node.subtype == "search":
visited_params = map(lambda node : node.accept(self), fun_node.params)
params_str = ', '.join(visited_params)
code = "search(%s)\n" % params_str
else:
code = "ERROR visit_fun\n"
return code
def visit_binop(self, binop_node):
op = binop_node.op
if (binop_node.right.type == "articleop"):
lhs = op = ""
else:
lhs = binop_node.left.accept(self).strip()
rhs = binop_node.right.accept(self).strip()
if binop_node.op == "=":
self.env[-1][lhs] = rhs
code = self.code_generator.generate_binaryOp(lhs, op, rhs)
return code
def visit_articleop(self, articleop_node):
if not articleop_node: return
lhs = articleop_node.left.accept(self).strip()
rhs = articleop_node.right.accept(self).strip()
#if articleop_node.op == "=":
# self.env[-1][lhs] = rhs
code = self.code_generator.generate_articleOp(lhs, articleop_node.op, rhs, articleop_node.assign_to, articleop_node.list_of_things)
return code
def visit_str(self, str_node):
return str_node.value
def visit_list(self, list_node):
return list_node.value
def visit_num(self, str_node):
return str(str_node)
def visit_id(self, id_node):
name = id_node.name
current_env = self.env[-1]
val = current_env[name]
return name
def visit_vardecl(self, decl_node):
init_vals = defaultdict(lambda:None)
init_vals['string'] = ''
init_vals['int'] = 0
self.env[-1][decl_node.name] = None
code = "%s = %s\n" % (decl_node.name, str(init_vals[decl_node.type]))
return code
def visit_forloop(self, for_node):
itr = for_node.itr.accept(self)
span = for_node.span.accept(self)
body = map(lambda n : n.accept(self), for_node.body)
code = self.code_generator.generate_forloop(itr, span, body)
return code
def visit_ifblock(self, if_node):
ifc = if_node.if_clause.accept(self).strip()
thc = map(lambda n : n.accept(self), if_node.then_clause)
elc = map(lambda n : n.accept(self), if_node.else_clause)
code = self.code_generator.generate_ifblock(ifc, thc, elc)
return code
def visit_astfundecl(self, fundecl_node):
varlist = map(lambda n : n.accept(self).strip(), fundecl_node.varlist)
fun_body = map(lambda n : n.accept(self), fundecl_node.stmtlist)
code = self.code_generator.generate_fundecl(fundecl_node.name, varlist, fun_body)
return code